Sharpener for the blades of edged tools



P. VON DER LIPPEN SHARPENER FOR THE BLADES OF" EDGED TOOLS Feb. 11, 1936.

Filed June 5, 1955 Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE SHARPENER FOR THE BLADES OF EDGED TOOLS Application June 3, 1935, Serial No. 24,683 In Germany May 3, 1935 2 Claims.

My present invention relates to the provision of a simple and effective sharpener for the blades of edged tools.

I have had as my principal object the provision of such a sharpener which may be made economically and sold at an attractive figure, and which will also provide a guide so as to properly present the blade to be sharpened to the sharpening surfaces, which sharpening surfaces are arranged so as to yield somewhat to the pressure with which the blade may be applied, thereby both helping to adapt the sharpening surfaces to the edge to be sharpened and also to minimize the liability of taking off too much metal in the sharpening operation.

I have attained the foregoing objects by means of the construction and arrangement shown in the accompanying drawing, in which- Fig. 1 is a side view of an embodiment of my invention to a scale suitable and convenient for domestic use.

Fig. 2 is a view of the metal portion of the sharpener detached from the mounting therefor.

Fig. 3 is a side elevation of the mounting detached from the metal portion.

Fig. 4 is a perspective showing the manner in which a knife may be sharpened with the sharpener.

Similar reference characters refer to similar parts throughout the respective views.

The base portion 5 may be conveniently made from a piece of wood of suitable thickness, which will generally be a quarter or three-eighths of an inch thick, and is preferably given an egg or pear shaped outline. The edge is channelled, as at 6, and running back from the more pointed end, which is slightly truncated, is a slot 1, which is of a sufficient width to take the blades which it is desired to sharpen and performs the function of guiding the edge of the blade in its contact with the sharpening surfaces.

The sharpening element proper is a length of, preferably, spring wire or rod 8 sufficiently long to completely occupy the groove 6 and extend across in front of the truncated end and groove 1 and lap.

The extending ends 8a of the rod 8 are provided with the upset striations of the order of file teeth except that they are of greater fineness than in most files. After the striations are provided the striated portions may be hardened in the usual manner. The fact that the striated and hardened area is relatively small permits me to make the tool economically.

I have also provided a perforation 9 in the base which will also be found of great convenience in hanging the sharpener in a readily accessible position.

The manner of use of the sharpener is clearly shown in Fig. 4, the blade being inserted in the slot 1 with the edge facing the open end of the slot. The tool and the blade are then brought in contact so that the parts of the hardened and striated surfaces adjacent the ends of the rod where they cross engage the blade of the knife and the tool and blade are then moved relatively to each other backwards and forwards longitudinally of the blade when it will be found that a uniform and acute juncture or meeting of the side surfaces of the blade has been secured.

The slight yielding of the wire or rod 8 during the sharpening operation prevents the same from digging into the edge of the tool.

Having described my invention what I claim is new and desire to secure by Letters Patent is:

1. A sharpener comprising a peripherally grooved base provided with a blade guiding slot communicating with the periphery thereof and a metal rod, the ends whereof are striated and hardened, disposed in said groove with said striated and hardened ends projecting and crossing opposite the opening in said slot.

2. A sharpener comprising a peripherally grooved base provided with a blade guiding slot communicating with the periphery thereof and a metal rod, the ends whereof are roughened and hardened, disposed in said groove with said roughened and hardened ends projecting and crossing opposite the opening in said slot.

PAUL VON DER LIPPEN. 

